Add missing TSDoc to CSV description helpers in transforms

[Copilot]

Recent updates left a few exported helper functions undocumented, which drifted from the repository’s function-level TSDoc standard. This PR adds targeted doc comments where behavior benefits from explicit parameter/return semantics.

• Documentation coverage (targeted)

  • Added TSDoc to categoryDescription, publisherDescription, and gameDescription in db/transforms.ts.
  • Comments document intent, input meaning, and output contract for each helper.

• Scope

  • Documentation-only change; no runtime logic, signatures, or data flow modified.

/**
 * Append the fixed crowdfunding call-to-action to a game's source description.
 *
 * @param rawDescription - Base description from the CSV row.
 * @returns The stored description including the crowdfunding blurb.
 */
export function gameDescription(rawDescription: string): string {
  return rawDescription + CROWDFUNDING_BLURB;
}

• Fixes Code lacks documentation #13

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